The function of the IKO bearing fit is to make the stationary and rotating rings of the needle bearing and the stationary part (usually the bearing seat) and the rotating part (usually the shaft) of the mounting part, respectively, to achieve the transfer of the load under rotation. And the basic task of defining the position of the motion system relative to the stationary system.
Needle bearings are required to be fixed in three directions, radial, axial and tangential, on the shaft and in the housing. The radial and tangential positioning is achieved by the tight fit of the bearing ring. The axial positioning is only used in a few cases. The axial position is generally limited by axial limit parts such as end caps and retaining rings. Within the clearance range.
When choosing a fit, you should pay attention to the following four points:
(1) The circumferential surface of the bearing ring should have good support and uniform force to reduce deformation, and fully exert the bearing capacity of IKO bearing.
(2) The ferrule cannot slide in the tangential direction in its mating surface, otherwise the mating surface will be damaged.
(3) The free end bearing must be compatible with the length change of the shaft and the housing bore, that is, it must have the ability to accommodate the axial position to swim within a certain range.
(4) It must be noted that the needle roller bearing is easy to install and disassemble, saving labor, time and money.
For heavy loads, the grease with a small penetration should be selected for high pressure, and the oil film strength and extreme pressure performance should be high. When selecting grease according to environmental conditions, calcium-based grease is not easily soluble in water and is suitable for drying and low moisture environments. Commonly used greases for IKO bearings include calcium-based greases, sodium-based greases, calcium-based greases, lithium-based greases, aluminum-based greases, and molybdenum disulfide greases. The amount of grease filled in the needle bearing is suitable for filling 1/2-1/3 of the inner space of the bearing. At high speeds, reducing the grease to 1/3 will increase the temperature rise.
The temperature of the bearing, generally the temperature outside the bearing can be inferred. If the oil hole can directly measure the outer ring temperature of the thin-walled bearing, it is more suitable. Usually, the temperature of the bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the needle bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the IKO bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.
For more information and purchase please visit: https://www.supplyforever.com
